Effect of type of protein on food intake of rats fed high protein diets

B. A. Semon, P. M.B. Leung, Quinton Rogers, D. W. Gietzen

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


The effects of type of protein on intake of a high protein diet after adapting rats to a low protein diet were examined in rats trained to eat a 5.2% (N×6.25) protein diet containing a mixture of casein, lactalbumin, egg white and soy protein, in a single 3-hour period per day. Food intake was measured from 0-15, 15-30, 30-90, and 90-180 minutes. After a 2-week adjustment period, rats were presented with a 40% (N×6.25) protein purified diet containing only one of the 4 proteins mentioned above or a mixture of these 4 proteins. During the first 15-minute interval, rats eating diets containing protein mixture, lactalbumin, egg white or soy protein depressed their intake significantly compared with the average intake of the 3-day pre-test period, whereas rats eating casein diet increased their intake. During the last 90-minute interval of the first day, all rats depressed their intake, those rats eating casein the least and those rats eating egg white the most. On the second day, rats offered lactalbumin depressed their intake 52.5% for the 3-hour period and rats offered casein depressed their intake 34.3%. Rats eating soy protein, egg white and protein mixture increased their intake from day 1 to day 2. These experiments show that type of protein affects rats' initial intake when they are offered a high protein diet. Because metabolite accumulation from the ingestion of various high protein diets is usually less immediate than sensory effects from the differences in taste and physical characteristics of the diet, food intake measurements by intervals over 3-hour meal feeding enables clearer distinction of acceptability and metabolic effects. The day on which maximum food intake depression occurs depends on which protein is used.

Original languageEnglish (US)
Pages (from-to)451-458
Number of pages8
JournalPhysiology and Behavior
Issue number5
StatePublished - Jan 1 1987


  • Caloric intake
  • Dietary choice
  • Different types of protein
  • High protein

ASJC Scopus subject areas

  • Experimental and Cognitive Psychology
  • Behavioral Neuroscience


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